利用python编写一个汇率计算器

发布时间：2020-11-10 15:03:44

来源：亿速云

阅读：137

作者：Leah

这篇文章运用简单易懂的例子给大家介绍利用python编写一个汇率计算器，内容非常详细，感兴趣的小伙伴们可以参考借鉴，希望对大家能有所帮助。

调用的api接口：

https://api.exchangerate-api.com/v4/latest/USD

完整代码

import requests

from tkinter import *

import tkinter as tk

from tkinter import ttk

class RealTimeCurrencyConverter():

def __init__(self,url):

self.data = requests.get(url).json()

self.currencies = self.data['rates']

def convert(self, from_currency, to_currency, amount):

initial_amount = amount

if from_currency != 'USD' :

amount = amount / self.currencies[from_currency]

amount = round(amount * self.currencies[to_currency], 4)

return amount

class App(tk.Tk):

def __init__(self, converter):

tk.Tk.__init__(self)

self.title = 'Currency Converter'

self.currency_converter = converter

self.geometry("500x200")

self.intro_label = Label(self, text = 'Welcome to Real Time Currency Convertor', fg = 'blue', relief = tk.RAISED, borderwidth = 3)

self.intro_label.config(font = ('Courier',15,'bold'))

self.date_label = Label(self, text = f"1 Indian Rupee equals = {self.currency_converter.convert('INR','USD',1)} USD \n Date : {self.currency_converter.data['date']}", relief = tk.GROOVE, borderwidth = 5)

self.intro_label.place(x = 10 , y = 5)

self.date_label.place(x = 160, y= 50)

valid = (self.register(self.restrictNumberOnly), '%d', '%P')

self.amount_field = Entry(self,bd = 3, relief = tk.RIDGE, justify = tk.CENTER,validate='key', validatecommand=valid)

self.converted_amount_field_label = Label(self, text = '', fg = 'black', bg = 'white', relief = tk.RIDGE, justify = tk.CENTER, width = 17, borderwidth = 3)

self.from_currency_variable = StringVar(self)

self.from_currency_variable.set("INR")

self.to_currency_variable = StringVar(self)

self.to_currency_variable.set("USD")

font = ("Courier", 12, "bold")

self.option_add('*TCombobox*Listbox.font', font)

self.from_currency_dropdown = ttk.Combobox(self, textvariable=self.from_currency_variable,values=list(self.currency_converter.currencies.keys()), font = font, state = 'readonly', width = 12, justify = tk.CENTER)

self.to_currency_dropdown = ttk.Combobox(self, textvariable=self.to_currency_variable,values=list(self.currency_converter.currencies.keys()), font = font, state = 'readonly', width = 12, justify = tk.CENTER)

self.from_currency_dropdown.place(x = 30, y= 120)

self.amount_field.place(x = 36, y = 150)

self.to_currency_dropdown.place(x = 340, y= 120)

self.converted_amount_field_label.place(x = 346, y = 150)

self.convert_button = Button(self, text = "Convert", fg = "black", command = self.perform)

self.convert_button.config(font=('Courier', 10, 'bold'))

self.convert_button.place(x = 225, y = 135)

def perform(self):

amount = float(self.amount_field.get())

from_curr = self.from_currency_variable.get()

to_curr = self.to_currency_variable.get()

converted_amount = self.currency_converter.convert(from_curr,to_curr,amount)

converted_amount = round(converted_amount, 2)

self.converted_amount_field_label.config(text = str(converted_amount))

def restrictNumberOnly(self, action, string):

regex = re.compile(r"[0-9,]*?(\.)?[0-9,]*$")

result = regex.match(string)

return (string == "" or (string.count('.') <= 1 and result is not None))

if __name__ == '__main__':

url = 'https://api.exchangerate-api.com/v4/latest/USD'

converter = RealTimeCurrencyConverter(url)

App(converter)

mainloop()

运行效果：

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